3/4 * 7/8 - 3/4 * (7/8 - 2/3) = 3/4 * 7/8 - 3/4 * (7 * 3 - 2 * 8)/24 = 3/4 * 7/8 - 3/4 * (21 - 16)/24 = 3/4 * 7/8 - 3/4 * 5/24 = 3/4 * (7/8 - 5/24) = 3/4 * (7 * 3 - 5 * 1)/24 = 3/4 * (21 - 5)/24 = 3/4 * 16/24 = 3/4 * 4/6 = 3/4 * 2/3 = 1/4 * 2/1 = 2/4 = 1/2 = 0,5;

Ответ:

1/2

Пошаговое объяснение:

=========================

3/4 * 7/8 - 3/4 * (7/8 - 2/3)

1) 7/8 - 2/3 = 21/24 - 16/24 = 5/24

2) 3/4 * 7/8 = 21/32

3) 3/4 * 5/24 = 5/32

4) 21/32 - 5/32 = 16/32 = 1/2

=========================